Subsystem Testing with Automated Generation of Test Cases. - Steve W. Chan; K. Simpson (Applied Informatics, 1999)

Providing user models direct access to interfaces: an exploratory study of a simple interface with implications for HRI and HCI. - Frank E. Ritter; Dirk Van Rooy; Robert St. Amant; K. Simpson (IEEE Trans. Syst. Man Cybern. Part A, 2006)